Arena is a small, gladiator inspired map for game modes; Last team standing, King of the Hill, Free For All and Duel.
The map in game mode LTS has a pit in the middle instead of a small wooden platform.
File name (lts): AOCLTS-Arena3_p
File name (koth): AOCKOTH-Arena3_P
File name (ffa): AOCFFA-Arena3_P
File name (duel): AOCDUEL-Arena3_P